ISL95870HRUZ-T Intersil, ISL95870HRUZ-T Datasheet - Page 9

• Manufacturer Part Number: ISL95870HRUZ-T
• Description: IC CTRLR PWM 1PHASE GPU 16UTQFN
• Manufacturer: Intersil

Specifications of ISL95870HRUZ-T

• Applications: Controller, GPU Core Power
• Voltage - Input: 3.3 V ~ 25 V
• Number Of Outputs: 1
• Voltage - Output: 0.5 V ~ 5 V
• Operating Temperature: -10°C ~ 100°C
• Mounting Type: *
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ISL95870B Functional Pin Descriptions
PIN NUMBER
Bottom Pad
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
SYMBOL
PGOOD
OCSET
PHASE
UGATE
LGATE
BOOT
PGND
SREF
SET0
SET1
SET2
PVCC
VID1
VID0
FSEL
GND
RTN
VCC
VO
EN
FB
9
Negative remote sense input of V
pin, the same resistor divider should be used at RTN pin, i.e. keep R
Logic input for setpoint voltage selector. Use in conjunction with the VID0 pin to select among four
setpoint reference voltages.
Logic input for setpoint voltage selector. Use in conjunction with the VID1 pin to select among four
setpoint reference voltages.
Soft-start and voltage slew-rate programming capacitor input and setpoint reference voltage
programming resistor input. Connects internally to the inverting input of the V
amplifier.
Voltage set-point programming resistor input.
Voltage set-point programming resistor input.
Voltage set-point programming resistor input.
Voltage feedback sense input. Connects internally to the inverting input of the control-loop error
transconductance amplifier. The converter is in regulation when the voltage at the FB pin equals
the voltage on the SREF pin.
Input for the overcurrent detection circuit. The overcurrent setpoint programming resistor R
connects from this pin to the sense node.
Output voltage sense input for the R
for the overcurrent detection circuit.
Input for programming the regulator switching frequency. Pull this pin to VCC for 1MHz switching.
Pull this pin to GND with a 100kΩ resistor for 600kHz switching. Leave this pin floating for 500kHz
switching. Pull this pin directly to GND for 300kHz switching.
Power-good open-drain indicator output. This pin changes to high impedance when the converter
is able to supply regulated voltage.
Enable input for the IC. Pulling EN above the rising threshold voltage initializes the soft-start sequence.
Return current path for the UGATE high-side MOSFET driver, V
and inductor current polarity detector input.
High-side MOSFET gate driver output. Connect to the gate terminal of the high-side MOSFET of
the converter.
Positive input supply for the UGATE high-side MOSFET gate driver. The BOOT pin is internally
connected to the cathode of the Schottky boot-strap diode. Connect an MLCC between the BOOT
pin and the PHASE pin.
Input for the IC bias voltage. Connect +5V to the VCC pin and decouple with at least a MLCC to
the GND pin.
Input for the LGATE and UGATE MOSFET driver circuits. The PVCC pin is internally connected to
the anode of the Schottky boot-strap diode. Connect +5V to the PVCC pin and decouple with a
MLCC to the PGND pin.
Low-side MOSFET gate driver output. Connect to the gate terminal of the low-side MOSFET of the
converter.
Return current path for the LGATE MOSFET driver. Connect to the source of the low-side MOSFET.
IC ground for bias supply and signal reference.
ISL95870, ISL95870A, ISL95870B
OUT
4
. If resistor divider consisting of R
modulator. The VO pin also serves as the reference input
DESCRIPTION
IN
sense input for the R
FB1
FB
=R
and R
FB
SET
, and R
OFS
voltage setpoint
December 22, 2009
is used at FB
4
OFS1
modulator,
=R
FN6899.0
OCSET
OFS
.